Abstract The total electric conductivity of two ceramics of cubic perovskites corresponding to x = 0.1 and x = 0.2 in the Sr1-xYxFeO3-δ solid solution has been measured by a 4-probe method in the temperature range from 298 K to 1373 K in air, allowing activation energies of ≈0.1–0.2 eV to be extracted. The effect of the oxygen partial pressure (PO2 = 0.21–10−15 atm) on the conductivity of the Sr0.8Y0.2FeO3-δ ceramic has also been investigated at high temperatures, i.e. at 1123 K, 1223 K and 1323 K. By analyzing the X-ray diffraction patterns of the quenched powder samples, the Po2-stability of Y0.2Sr0.8FeO3-δ has been determined. These results are discussed in terms of the defect structure in Sr1-xYxFeO3-δ, which accounts well for the present data and especially the sign change of the majority charge carriers as PO2 is reduced. This study presents important new features of the total conductivity with respect to temperature and oxygen non-stoichiometry in these ceramics.

中文翻译：

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陶瓷Sr1-xYxFeO3-δ固溶体的电导率和稳定性

摘要 采用四探针法在空气中 298 K 至 1373 K 的温度范围内测量了对应于 x = 0.1 和 x = 0.2 的两种立方钙钛矿陶瓷在 Sr1-xYxFeO3-δ 固溶体中的总电导率。 ，允许提取 ≈0.1–0.2 eV 的活化能。还研究了高温下（即 1123 K、1223 K 和 1323 K）氧分压（PO2 = 0.21–10-15 atm）对 Sr0.8Y0.2FeO3-δ 陶瓷电导率的影响。分析淬火粉末样品的 X 射线衍射图谱，确定了 Y0.2Sr0.8FeO3-δ 的 Po2 稳定性。这些结果根据 Sr1-xYxFeO3-δ 中的缺陷结构进行了讨论，这很好地解释了当前数据，尤其是随着 PO2 减少，多数电荷载流子的符号变化。